Thanks Ian, you convinced me that the so-called original rivets were not the way to go.
I tried to close a couple up and it was not a nice experience.
With a lot less effort than I expected I reprofiled the heads of some rivets we keep in stock.
The only real pain was that they were about an 1/8" too long.

Below the pictures of the shaft and rivets in place.
I used a course polishing mop to debur the heads.
Followed by an ultra-sonic bath.

Mark

email (option): pes.sales@btconnect.com

That looks great work mark - painful but great

Have you ever swapped out the flywheel thrust washers fitted - they are secured with rivets too ?
Br
Jo’b

email (option): jonnyob1@googlemail.com

Thanks John,
I haven't, but I can't see an issue with it. Yes, they are riveted too.

Mark

email (option): pes.sales@btconnect.com

This should be a golden opportunity for any rivet counter...How many rivets are there on an M20?..(it's a lot more than you would think)..Ian:relaxed:

email (option): ian@wright52.plus.com

Just in case anyone has the same problem with the shafts in their M20 cranks I'm happy to offer a repair service.

Shafts and rivets in stock

Mark

https://pesltd.uk/?product=66-0644
https://pesltd.uk/?product=66-0640

email (option): pes.sales@btconnect.com